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// Copyright 2020 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.lib.exec;
import static com.google.common.truth.Truth.assertThat;
import com.google.common.io.ByteStreams;
import com.google.devtools.build.lib.util.io.OutErr;
import com.google.devtools.build.lib.vfs.DigestHashFunction;
import com.google.devtools.build.lib.vfs.FileSystemUtils;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.inmemoryfs.InMemoryFileSystem;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** Tests for {@link StreamedTestOutput}. */
@RunWith(JUnit4.class)
public class StreamedTestOutputTest {
private final InMemoryFileSystem fileSystem = new InMemoryFileSystem(DigestHashFunction.SHA256);
@Test
public void testEmptyFile() throws IOException {
Path watchedPath = fileSystem.getPath("/myfile");
FileSystemUtils.writeContent(watchedPath, new byte[0]);
ByteArrayOutputStream out = new ByteArrayOutputStream();
ByteArrayOutputStream err = new ByteArrayOutputStream();
try (StreamedTestOutput underTest =
new StreamedTestOutput(OutErr.create(out, err), fileSystem.getPath("/myfile"))) {}
assertThat(out.toByteArray()).isEmpty();
assertThat(err.toByteArray()).isEmpty();
}
@Test
public void testNoHeaderOutputsEntireFile() throws IOException {
Path watchedPath = fileSystem.getPath("/myfile");
FileSystemUtils.writeContent(watchedPath, StandardCharsets.UTF_8, "random\nlines\n");
ByteArrayOutputStream out = new ByteArrayOutputStream();
ByteArrayOutputStream err = new ByteArrayOutputStream();
try (StreamedTestOutput underTest =
new StreamedTestOutput(OutErr.create(out, err), fileSystem.getPath("/myfile"))) {}
assertThat(out.toString(StandardCharsets.UTF_8.name())).isEqualTo("random\nlines\n");
assertThat(err.toString(StandardCharsets.UTF_8.name())).isEmpty();
}
@Test
public void testOnlyOutputsContentsAfterHeaderWhenPresent() throws IOException {
Path watchedPath = fileSystem.getPath("/myfile");
FileSystemUtils.writeLinesAs(
watchedPath,
StandardCharsets.UTF_8,
"ignored",
"lines",
TestLogHelper.HEADER_DELIMITER,
"included",
"lines");
ByteArrayOutputStream out = new ByteArrayOutputStream();
ByteArrayOutputStream err = new ByteArrayOutputStream();
try (StreamedTestOutput underTest =
new StreamedTestOutput(OutErr.create(out, err), fileSystem.getPath("/myfile"))) {}
assertThat(out.toString(StandardCharsets.UTF_8.name()))
.isEqualTo("included" + System.lineSeparator() + "lines" + System.lineSeparator());
assertThat(err.toString(StandardCharsets.UTF_8.name())).isEmpty();
}
@Test
public void testWatcherDoneAfterClose() throws IOException {
Path watchedPath = fileSystem.getPath("/myfile");
FileSystemUtils.writeLinesAs(
watchedPath, StandardCharsets.UTF_8, TestLogHelper.HEADER_DELIMITER, "x".repeat(10 << 20));
StreamedTestOutput underTest =
new StreamedTestOutput(
OutErr.create(ByteStreams.nullOutputStream(), ByteStreams.nullOutputStream()),
fileSystem.getPath("/myfile"));
underTest.close();
assertThat(underTest.getFileWatcher().isAlive()).isFalse();
}
@Test
public void testInterruptWaitsForWatcherToClose() throws IOException {
Path watchedPath = fileSystem.getPath("/myfile");
FileSystemUtils.writeLinesAs(
watchedPath, StandardCharsets.UTF_8, TestLogHelper.HEADER_DELIMITER, "x".repeat(10 << 20));
StreamedTestOutput underTest =
new StreamedTestOutput(
OutErr.create(ByteStreams.nullOutputStream(), ByteStreams.nullOutputStream()),
fileSystem.getPath("/myfile"));
try {
Thread.currentThread().interrupt();
underTest.close();
assertThat(underTest.getFileWatcher().isAlive()).isFalse();
} finally {
// Both checks that the interrupt bit was reset and clears it for later tests.
assertThat(Thread.interrupted()).isTrue();
}
}
@Test
public void testOutputsFileWithHeaderRegardlessOfInterrupt() throws IOException {
Path watchedPath = fileSystem.getPath("/myfile");
FileSystemUtils.writeContent(watchedPath, StandardCharsets.UTF_8, "blahblahblah");
ByteArrayOutputStream out = new ByteArrayOutputStream();
ByteArrayOutputStream err = new ByteArrayOutputStream();
StreamedTestOutput underTest =
new StreamedTestOutput(OutErr.create(out, err), fileSystem.getPath("/myfile"));
try {
Thread.currentThread().interrupt();
underTest.close();
assertThat(underTest.getFileWatcher().isAlive()).isFalse();
} finally {
// Both checks that the interrupt bit was reset and clears it for later tests.
assertThat(Thread.interrupted()).isTrue();
}
assertThat(out.toString(StandardCharsets.UTF_8.name())).isEqualTo("blahblahblah");
assertThat(err.toString(StandardCharsets.UTF_8.name())).isEmpty();
}
}